\input zb-basic
\input zb-ioport
\iteman{io-port 50200770}
\itemau{Bork, Alfred}
\itemti{What is needed for effective learning on the internet?}
\itemso{Educational Technology & Society 4, No. 3 (2001).}
\itemcc{}
\itemut{}
\itemli{http://ifets.ieee.org/periodical/vol\_3\_2001/bork.html}
\end